摩卡异步/等待测试失败并超时

Question

我想用 测试异步代码Mocha。

我按照本教程testing-promises-with-mocha进行操作。最后，它说最好的方法是 async/await。

以下是我的代码，我打算将 setTimeout 设置得比 Mocha 默认值长。

describe('features', () => {
  it('assertion success', async() => {
    const resolvingPromise = new Promise( resolve => {
      setTimeout(() => {
        resolve('promise resolved')
      }, 3000)
    })

    const result = await resolvingPromise
    expect(result).to.equal('promise resolved')
  })
})

摩卡给我错误如下：

Error: Timeout of 2000ms exceeded. For async tests and hooks, 
ensure "done()" is called; if returning a Promise, ensure it resolves...

如何解决该错误？简单设置mocha --timeout 10000更长？

谢谢你的时间！

Mocha: 5.2.0
Chai: 4.2.0

Answer 1

Mocha 有超时控制。摩卡文档

语法是：

it('should take less than 500ms', function(done) {
  this.timeout(5000); // 5 seconds
  setTimeout(done, 3000);
});

你的例子：

describe('features', () => {
  it('assertion success', async (done) => {
    this.timeout(5000);
    const resolvingPromise = new Promise(resolve => {
      setTimeout(() => resolve('promise resolved'), 3000)
    });

    const result = await resolvingPromise();
    expect(result).to.equal('promise resolved');
    done();
  });
});